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电化学(中英文) ›› 2013, Vol. 19 ›› Issue (1): 53-58.  doi: 10.61558/2993-074X.2097

• 电化学材料基础与表界面研究专辑(中国科学院化学研究所 万立骏院士主编) • 上一篇    下一篇

离子交换-电沉积法制备高Pt利用率多孔电极

陈四国,丁 炜,齐学强,李 莉,邓子华,魏子栋*   

  1. 重庆大学 输配电装备及系统安全新技术国家重点实验室,化学化工学院,重庆 400044
  • 收稿日期:2012-06-04 修回日期:2012-06-30 出版日期:2013-02-28 发布日期:2012-07-05
  • 通讯作者: 魏子栋 E-mail:zdwei@cqu.edu.cn
  • 基金资助:

    国家自然科学基金项目(No. 20676156, No. 51072239, No. 21176327)资助

Porous Electrodes with High Pt Utilization Obtained by Ion-Exchange/Electrodeposition

CHEN Si-guo, DING Wei, QI Xue-qiang, LI Li, DENG Zi-hua, WEI Zi-dong*   

  1. The State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Department of Chemistry, College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
  • Received:2012-06-04 Revised:2012-06-30 Published:2013-02-28 Online:2012-07-05
  • Contact: WEI Zi-dong E-mail:zdwei@cqu.edu.cn

摘要: 采用离子交换-电沉积的方法(Ion-exchange/electrodeposition,IEE)制备了一种高Pt利用率催化电极,对所制备电极的表面形貌、催化活性及单电池性能用线性扫描伏安(LSV)、扫描电镜(SEM)、透射电镜(TEM)和单电池测试进行了表征. 结果表明,通过电极制备工艺和离子交换-电沉积参数的调控,能够消除碳载体表面官能团的影响,使铂阳离子只与全氟磺酸树脂(Nafion)上的H+进行交换. 在无铂离子的电解质中,将被交换的铂阳离子还原到与Nafion接触的碳载体上,使每一个铂纳米粒子都处于气体多孔电极的三相界面上,有效地调控铂纳米粒子的尺寸和分散度. 单电池测试表明,以铂载量为0.014 mgPt•cm-2的IEE电极组装的电池的输出功率与铂载量为0.3 mgPt•cm-2的Nafion粘接Pt/C电极相当.

关键词: 燃料电池, 离子交换-电沉积, 铂利用率

Abstract: We report a novel method based on ion-exchange/electrodeposition (IEE) for constructing high Pt utilization porous electrodes. The electrode prepared using IEE was assessed by linear sweep voltammetry (LSV), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and single cell test. The preliminary results show that the undesired ion-exchange between Pt anion and surface functional group in carbon black can be eliminated through the electrode preparation process, and every Pt particle prepared by IEE is expected to be deposited on the three-phase reaction zone and thus can be fully utilized in fuel cell reactions. The Pt particle size, shape and distribution obtained by IEE can be controlled by modulating the IEE technique and cycles. The power output of the MEA employing a Pt/C electrode prepared by IEE with a Pt loading of 0.014 mgPt•cm-2 is equivalent to that employing a conventional Nafion-bonded Pt/C electrode with a Pt loading of 0.3 mgPt•cm-2.

Key words: fuel cells, ion-exchange/electrodeposition, Pt utilization

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